Needle-valve for carbureters



l. T. SWARTZ NEEDLE VALVE FOR CARBURETERS.

APPLICATION FILED NOV. 15, 1918.

. Patented Mar. 30, 1920.

Fig.2.

I INV NTOR. Z1, 3

WITNESS: Wm 24 7 7. ATTORNES v ETNKTEEED Sii fiiii hlS @FFEQE.

IRA 'I. SWARTZ, OF INDIANAPQLIS, INDIANA, ASSIGNOB, '10 SW'ARTZ ELECTRICCOMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION QF INDIANA.

NEEDLE-VAL JE FOR CARBURETEPJS.

Application filed November 15, 1918.

To all whom it may concern:

Be it known that I, IRA T. Swaa'rz, a citizen of the United States,residing at Indianapolis, Marion county, and State of Indiana, haveinvented and discovered certain new and useful Improvements inNeedle-Valves for Carburetors, of which the following is aspecification.

My invention relates to needle valves for carbureters and its objectsare to provide means to enable the needle valve to be adjusted to itsproper feeding position without the necessity of taking the carbureterapart, to limit the ran e of adjustment by a stop so that the stem ofthe valve will not be turned beyond the circle of rotation within whichit is set originally thereby preventing the user from losing theoriginal point of adjustment, and to provide for indicating the properand normal point of adjustment of the valve.

With these objects in view my invention is embodied in preferable formin the construction hereinafter described and illustrated in theaccompanying drawings.

In these drawings, Figure 1 is a longitudinal section through acarburetershowing my invention applied thereto, and 2, is a perspectiveView of the holding and stopping means for the valve stem.

Referring to the drawings, 1 indicates the liquid fuel containingchamber of a carbureter of usual construction and 2, the mixing chamber.Mounted in the wall between the two chambers is a gasolene feed pipe 3within which is .mounted adjustable needle valve 4: adapted to controlthe exit opening 5 from the end of the pipe 3. The valve stem 6 of theneedle valve projects through the wall of the carbureter to the outsidethereof and on its end is provided with a knurled finger wheel or disk 7whereby the valve stem is adapted to be rotated so as to draw the valveaway from or toward the opening 5 to increase or decrease the flow ofgasolene, such rotatable movement being efiected by the engagement ofthe screw threads 8 on the stem with suitable interior threads in abushing 9. Fixed in the bushing 9 by nut 10 is an angled disk detentmember including a spring arm 11. This arm projects out to a pointopposite the sur face of the operating disk and is there pro vided witha projecting detent catch 12 adapted to engage the recesses between theSpecification of Letters Patent. v Patented Blair. 39, 1920.

Serial No. 262,738.

13 which is adapted to make contact against either side of the arm 11 ina rotatable adjustment of the disk. I

The operation of the device is as follows: Before the carburetor is sentout the needle valve is adjusted to the normal feeding position thereof.The stop pin 13 and the spring detent arm 11 are so located relativelyto the needle valve that in this normal, original position of adjustmentthe stop pin will be diametrically opposite the tooth or catch of thedetent arm as shown in Fig. 1. From this normal, original point ofadjustment it is usually necessary to project the needle valve withinthe range of the movement permitted by the rotation of the operatingdisk throughout one revolution of the latter. The stop pin from suchadjusting movement will be carried against either side of the spring arm11, thus preventing the turning of the disk to a point beyond. suchsingle revolution and thus avoiding the loss of the location of theoriginal zero point of adjustment, In any adjustment of the disk thedetent catch at the end of the spring arm 11 will engage the teeth onthe k1 urled periphery of the disk holding the same firmly in positionand preventing any accidental displacement of the disk and valve. Shouldit be necessary for any unusual reason to turn the stop pin on the diskfarther than one revolution, this.

may be done by pressing back the spring detent arm 11 and moving stop 13past the same.

Having thus described my invention, what I claim is:

1. In a carburetor, in combination with a needle valve, a spring detentfor holding it in adjusted position and stop means cooperating with saidspring detent for limiting the adjustment within a predetermined rangeof movement, said spring detent being adapted to be moved past saidstop.

2. In a carbureter, in combination with a needle valve, and its stem, aknurled disk on the stem exteriorof the carbureter, a spring detent forengaging the periphery of the disk and a stop pin projecting from theperiphery of the disk and adapted to contact With said detent to limitthe range of adjustment of the disk and Valve, said spring detent beingadapted to be moved past said stop.

In Witness whereof I have hereunto set my hand and seal at Indianapolisthis 20 10 day of September, A. D. nineteen hundred and eighteen.

IRA T. SVVARTZ. [1. s]

Witnesses: I

M. L. SHULER, H. P. DOOLITTLE.

